Customer Satisfaction - Front Axle Vent Tube Kinked-Fluid Leak

*****THIS PROGRAM IS IN EFFECT UNTIL DECEMBER 31, 2008.*****

On certain 2007-2008 model year Chevrolet Silverado and GMC Sierra 2500/3500 series four-wheel drive vehicles, the front axle vent tube may be kinked. Prior to vehicle assembly, the tube is kinked and secured with tape to prevent axle fluid leakage. On some of these vehicles, the tape may not have been removed upon completion of vehicle assembly. This could restrict venting when the vehicle is driven for long periods of time in four-wheel drive. If the venting is not adequate, pressure will build in the tube, resulting in axle fluid leakage. If this condition is undetected, permanent damage to the front differential components could result.

Dealers are to inspect the front differential vent tube, and if necessary, remove the tape and straighten the tube to ensure proper venting. Dealers are to also inspect the front axle for fluid leaks, and add axle fluid if required. Because the inspection is quite simple, and to reduce customer inconvenience, U.S. customers are being given the option to perform the inspection themselves or have their dealer perform the inspection. If a customer finds a kinked tube, they are being instructed to remove the tape, straighten the tube, and then schedule an appointment with their dealer for an axle inspection.

Involved are certain 2007-2008 model year Chevrolet Silverado and GMC Sierra 2500/3500 series four-wheel drive vehicles built within these VIN breakpoints:

Important: Dealers are to confirm vehicle eligibility prior to beginning repairs by using the GM Vehicle Inquiry System (GMVIS). Not all vehicles within the above breakpoints may be involved.

For dealers with involved vehicles, a listing with involved vehicles containing the complete vehicle identification number, customer name, and address information has been prepared and will be provided through the applicable system listed below. Dealers will not have a report available if they have no involved vehicles currently assigned.

-- US dealers - GM DealerWorld Recall Information

-- Canadian dealers - GMinfoNet Recall Reports

-- Export dealers - sent directly to dealers

The listing may contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any purpose other than follow-up necessary to complete this program is a violation of law in several states/provinces/countries. Accordingly, you are urged to limit the use of this report to the follow-up necessary to complete this program.

Parts required to complete this program are to be obtained from General Motors Service and Parts Operations (GMSPO). Please refer to your "involved vehicles listing" before ordering parts. Normal orders should be placed on a DRO = Daily Replenishment Order. In an emergency situation, parts should be ordered on a CSO = Customer Special Order.

1. Open the hood.

The General Motors Courtesy Transportation program is intended to minimize customer inconvenience when a vehicle requires a repair that is covered by the New Vehicle Limited Warranty. The availability of courtesy transportation to customers whose vehicles are within the warranty coverage period and involved in a product program is very important in maintaining customer satisfaction. Dealers are to ensure that these customers understand that shuttle service or some other form of courtesy transportation is available and will be provided at no charge. Dealers should refer to the General Motors Service Policies and Procedures Manual for Courtesy Transportation guidelines.

Submit a Product Claim with the information indicated below:

Refer to the General Motors WINS Claims Processing Manual for details on Product Recall Claim Submission.

General Motors will notify customers of this program on their vehicle (see copy of customer letter included with this bulletin).

Letters will be sent to known owners of record located within areas covered by the US National Traffic and Motor Vehicle Safety Act. For owners outside these areas, dealers should notify customers using the attached sample letter.

All unsold new vehicles in dealers' possession and subject to this program must be held and inspected/repaired per the service procedure of this program bulletin before customers take possession of these vehicles.

Dealers are to service all vehicles subject to this program at no charge to customers, regardless of mileage, age of vehicle, or ownership, through December 31, 2008.

Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer information indicated on the dealer listing, are to be contacted by the dealer. Arrangements are to be made to make the required correction according to the instructions contained in this bulletin. A copy of the customer letter is provided in this bulletin for your use in contacting customers. Program follow-up cards should not be used for this purpose, since the customer may not as yet have received the notification letter.

In summary, whenever a vehicle subject to this program enters your vehicle inventory, or is in your dealership for service through December 31, 2008, you must take the steps necessary to be sure the program correction has been made before selling or releasing the vehicle.

Dear General Motors Customer:

We have learned that your 2007 or 2008 model year Chevrolet Silverado or GMC Sierra may have been built with a kinked front axle vent tube. Prior to vehicle assembly, the tube is kinked and secured with tape to prevent axle fluid leakage. On some of these vehicles, the tape may not have been removed upon completion of vehicle assembly. This could restrict venting when the vehicle is driven for long periods of time in four-wheel drive. If the venting is not adequate, pressure will build in the tube, resulting in axle fluid leakage. If this condition is undetected, permanent damage to the front differential components could result.

Your satisfaction with your 2007 or 2008 model year Chevrolet Silverado or GMC Sierra is very important to us, so we are announcing a program to prevent this condition or, if it has occurred, to fix it.

What We Will Do:

Your GM dealer will inspect the front differential vent tube, and if necessary, remove the tape and straighten the tube to ensure proper venting. The front axle will also be inspected for fluid leaks and fluid will be added if required. This service will be performed for you at no charge until December 31, 2008.

What You Should Do:

Do not drive your vehicle in four-wheel drive until the inspection has been performed . Please contact your dealer as soon as possible to schedule an appointment for this inspection.

For U.S. Only: Since the inspection procedure is simple to perform, and to reduce your inconvenience, we have included an inspection procedure with this letter in the event you would prefer to perform the inspection yourself.

Customer Reply Form: The enclosed customer reply form identifies your vehicle. Presentation of this form to your dealer will assist in making the necessary correction in the shortest possible time. If you no longer own this vehicle, please let us know by completing the form and mailing it back to us.

If you have any questions or need any assistance, just contact your dealer or the appropriate Customer Assistance Center at the number listed below. The Customer Assistance Center’s hours of operation are from 8:00 AM to 11:00 PM, EST, Monday through Friday.

Courtesy Transportation: If your vehicle is within the New Vehicle Limited Warranty your dealer may provide you with shuttle service or some other form of courtesy transportation while your vehicle is at the dealership for this repair. Please refer to your Owner’s Manual and your dealer for details on Courtesy Transportation.

We sincerely regret any inconvenience or concern that this situation may cause you. We want you to know that we will do our best, throughout your ownership experience, to ensure that your GM vehicle provides you many miles of enjoyable driving.

Scott Lawson

General Director,

Customer and Relationship Services

Enclosure

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